package chances.system.operator.web;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.Random;

import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.apache.commons.lang.StringUtils;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

import chances.system.json.JsonResponse;



@RestController
public class ValidateCodeController {
	
	@RequestMapping(path = "/sys/validateCode/generate", method = RequestMethod.GET)
	public void generate(HttpServletRequest request, HttpServletResponse response) {
		response.setHeader("Pragma", "No-cache");
        response.setHeader("Cache-Control", "no-cache");
        response.setDateHeader("Expires", 0);

        int width = 85, height = 33;
        BufferedImage image = new BufferedImage(width, height,
                BufferedImage.TYPE_INT_RGB);
        Graphics g = image.getGraphics();
        Random random = new Random();
        g.setColor(getRandColor(200, 250));
        g.fillRect(0, 0, width, height);

        g.setFont(new Font("Times New Roman", Font.PLAIN, 28));

        g.setColor(getRandColor(160, 200));
        for (int i = 0; i < 155; i++) {
            int x = random.nextInt(width);
            int y = random.nextInt(height);
            int xl = random.nextInt(12);
            int yl = random.nextInt(12);
            g.drawLine(x, y, x + xl, y + yl);
        }

        String sRand = "";
        for (int i = 0; i < 4; i++) {
            String rand = String.valueOf(random.nextInt(10));
            sRand += rand;
            g.setColor(new Color(20 + random.nextInt(110), 20 + random
                    .nextInt(110), 20 + random.nextInt(110)));
            g.drawString(rand, 21 * i + 2, 26);
        }
        HttpSession session = request.getSession(true);

        session.setAttribute("rand", sRand);

        g.dispose();
        
        ServletOutputStream out = null;
        try {
        	out = response.getOutputStream();
            ImageIO.write(image, "JPEG",out);
            out.flush();
            out.close();
    		response.flushBuffer();
		} catch (Exception e) {
		}finally {
			try {
				if (out != null) {
					out.close();
					response.flushBuffer();
				}
			} catch (IOException e) {
			}
		}  
	}
	
	@RequestMapping(path = "/sys/validateCode/{code}", method = RequestMethod.GET)
	public JsonResponse validate(HttpServletRequest request,
			@PathVariable("code") String code, Model model) {

		JsonResponse response = new JsonResponse();
		String rand = (String) request.getSession().getAttribute("rand");
        if (StringUtils.isBlank(rand) || !rand.equals(code)) {
			response.setResult(JsonResponse.RESULT_FAILED);
			response.setMessage("验证码错误");
		}
		return response;
	}
	
	public Color getRandColor(int fc, int bc) {
        Random random = new Random();
        if (fc > 255)
            fc = 255;
        if (bc > 255)
            bc = 255;
        int r = fc + random.nextInt(bc - fc);
        int g = fc + random.nextInt(bc - fc);
        int b = fc + random.nextInt(bc - fc);
        return new Color(r, g, b);
    }
}
